Abstract: Dimethyl carbonate and methyl tert-butyl ether are prepared by a continuous integrated process comprising:a) feeding methanol, carbon monoxide and oxygen into a reaction environment maintained under methanol oxidative carbonylation conditions, to form a liquid reaction mixture containing dimethyl carbonate and unaltered methanol;b) at least partly eliminating the water from the reaction mixture of stage a);c) feeding the dehydrated mixture of stage b) and isobutene, or a hydrocarbon fraction containing isobutene, into a reaction environment maintained under etherification conditions, to form a liquid reaction mixture containing dimethyl carbonate and methyl tert-butyl ether; andd) recovering the dimethyl carbonate and methyl tert-butyl ether from the reaction mixture of stage c).